Sphinxcontrib-opencontracting

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- feat: Add :ref:`workedexample and workedexamplelist<workedexample>` directives.
- Add PyPy support.

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- fix: :ref:`extensionexplorerlinklist`: Use ``en`` as fallback if a language is not supported.

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- Remove ``codelisttable`` directive. Use ``csv-table`` with MyST-Parser instead.
- Add Python wheels distribution.

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First release.